Foam Plant On Thickness (2006 IBC)

The first and most critical item is to stay below the “potential heat source” or fuel source as set by the National Fire Protection Association in NFPA 285. The potential heat source is expressed in British Thermal Units (BTU’s) and the maximum BTU shall not exceed 6,000 BTU in a square foot when tested per NFPA 259 and in accordance with NFPA 285 (IBC section 2603.5.3). This generally translates to four inches or less of foam plastic sheathing on exterior walls, provided the flame spread index of the foam plastic does not exceed 25 and has a smoke-develop index of less than 450. Check with the foam manufacturer for details on thier products flamespread.
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